ML20086U532
| ML20086U532 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 03/01/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NCR-2515, NUDOCS 8403070294 | |
| Download: ML20086U532 (2) | |
Text
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TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 374o1 400 Chestnut Street Tower II NMO 8 pgrch 1, 1984 II BLRD-50-438/83-58 BLRD-50-439/83-51 U.S. Nuclear Regulatory Commission
-Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101-Marietta Street, NW, Suite 2900 cAtlanta, Georgia 30303
Dear Mr. O'Reilly:
-BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - CARBON STEEL DOWEL PIN FOUND IN HIGH-PRESSURE INJECTION PUMP - BLRD-50-438/83-58, BLRD-50-439/83 -SECOND INTERIM REPORT The -subject deficiency was initially reported to NRC-0IE Inspector
, R;ss Butcher on November 9,1983 in accordance with 10 CFR 50.55(e) as NCR 2515. This was followed by our interim report dated December 6,1983 Enclosed is our second ir.terim report. We expect to submit our next report by August 22, 1984.-
_ If you have any questions, please.get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Licensing Enclosure to:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle (5 Parkway, Suite 1500 Atlanta, Georgia 30339 f3070294840301 E
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1983-TVA 5OTH ANNIVERSARY An Equal Opportunity Employer
N ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 CARBON STEEL DOWEL PIN FOUND IN HIGH-PRESSURE INJECTION PUMP BLRD-50-438/83-58, BLRD-50-439/83-51 NCR 2515 10 CFR 50.55(e)
SECOND INTERIM REPORT Description of Deficiency The makeup /high-pressure injection (MU/HPI) pumps are two-stage centrifugal pumps designed and built by Bingham-Willamette of Portland, Oregon. The pumps contain a horizontal rotating element housed in a double casing. The outer casing, which carries the discharge pressure, is.a fabricated pressure vessel with removable end covers secured by a series of studs. The inner casing consists of two castings which are machined and lapped at their mating surfaces and tre bolted together around the rotating element.
During a recent disassembly of one of the MU/HPI pumps, a carbon steel dowel pin was found in a tapered hole in the inner casing. The dowel pin was used to align the inner casing during assembly and should have been removed following torquing of the inner case bolts. The pin was located such that it came in contact with the pump fluid and had rusted.
The apparent cause of the deficiency was the breakdown in the manufacturer's Quality. Assurance program since the pump manufacturer failed to mmove the dowel pin during the initial casembly of the pump and/or failed to provide TVA with information regarding inspection / removal of the pin.
-Interim Progress The ' pin in the subject pump (TVA UNID No.1NV-MPMP-002A) will be removed.
The rust caused by the pin will be removed according to TVA-approved procedures. A wet-cloth test will be performed to verify that no residual rust maains.
The five other pumps of identical design will be inspected to assure that the
.Clignment pins have been removed. If any pins are found, they will be removed along with any rust which they have caused. A wet-cloth test will be performed to verify that no residual rust remains. If rust is observed in Cny alignment holes where no pin is present, the rust will be removed and the surface tested.
TVA is in the process of determining what actions will be taken to prevent recurrence.
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